Lru Fault Diagnosis; Figure 5-3 Fault Diagnostic Tree For Power Loss - L3 Communications MX-15i Operation & Maintenance Manual

TM00358 Rev. A

5.3 LRU FAULT DIAGNOSIS

Most system failures will be detected by a system or sensor BIT. However, there are some failures that might
prevent the BIT from functioning and assist with determining the failure. In absence of a BIT alarm, operators should
follow the Fault Diagnostic Trees for system power or video failures, and attempt to isolate and resolve the failure
before contact L-3 Wescam for assistance.
The Fault Diagnosis Trees are a guide to find and correct faults. Use them to reduce delays and unnecessary
replacement of system components. It is assumed that the fault is caused by a single failure or malfunction.
The Fault Diagnosis Trees are in a logic-diagram format. Each action is followed by a question with a yes or no
answer. The answer gives either another question or a solution. Do the necessary steps to isolate the cause of the
fault.
Turret
Power
Failure
Check Hand
Controller
Power Status
No
Reinstall
Hand Controller
Cable
No
Check Circuit
Breaker
No
Check Aircraft
power supply
No
Check
Continuity of
Turret Power
Cable
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Yes Cycle Power
Light ON
Yes Cycle Power
Light ON
Breaker
Yes Restore Breaker
OFF
No
Yes Restore Power
+28VDC
Supply
Replace Power
Cable
Yes
PIN Break
Cable
No Replace Turret

Figure 5-3 Fault Diagnostic Tree for Power Loss

Chapter 5 - LRU Fault Diagnosis
Turret
Cycle Power
Powers
No
Turret
Cycle Power
Powers
No
Yes
Turret Operational
Contact
L-3 Wescam
Customer Service
October 2007
97